BREAKING CHANGE(mta): migrate internal MTA to @push.rocks/smartmta and remove legacy mail/deliverability implementation

ts/index.ts

@@ -1,5 +1,8 @@
 export * from './00_commitinfo_data.js';
-export * from './mail/index.js';
+
+// Re-export smartmta (excluding commitinfo to avoid naming conflict)
+export { UnifiedEmailServer } from '@push.rocks/smartmta';
+export type { IUnifiedEmailServerOptions, IEmailRoute, IEmailDomainConfig } from '@push.rocks/smartmta';
 
 // DcRouter
 export * from './classes.dcrouter.js';
@@ -7,4 +10,4 @@ export * from './classes.dcrouter.js';
 // RADIUS module
 export * from './radius/index.js';
 
-export const runCli = async () => {}
+export const runCli = async () => {};